Solaris zfs 更換根池磁盤 (Replace a Disk in the ZFS Root Pool)

某些時候，由於空間不足或是硬件故障等原因，我們需要更換啟動磁盤。

冗余池(mirrored pool)

在一個鏡像池裡面更遠硬盤相對簡單一些，只需要用replace命令直接更換硬盤即可。

1. # zpool offline rpool c1t0d0s0
   
2. # cfgadm -c unconfigure c1::dsk/c1t0d0
3. <Physically remove failed disk c1t0d0>
4. <Physically insert replacement disk c1t0d0>
5. # cfgadm -c configure c1::dsk/c1t0d0
6. # zpool replace rpool c1t0d0s0
7. # zpool online rpool c1t0d0s0
8. # zpool status rpool
9. <Let disk resilver before installing the boot blocks>
10. SPARC# installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c1t0d0s0
11. x86# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c1t9d0s0

非冗余池

如果根池不是mirrored，那麼就需要先把新磁盤分區好，加入根池形成mirrored類型的池。

加入新盤並檢測

# devfsadm

分區並打標簽

1. # format -e c8t1d0
   
3. format> partition
4. SELECT ONE OF THE FOLLOWING:
5. 1. Create a partition
6. ...
8. partition> print
9. Current partition table (original):
10. Total disk cylinders available: 30398 + 2 (reserved cylinders)
12. Part Tag Flag Cylinders Size Blocks
13. 0 root wm 1 - 30396 232.85GB (30396/0/0) 488311740
14. 1 unassigned wu 0 0 (0/0/0) 0
15. 2 backup wu 0 - 30396 232.85GB (30397/0/0) 488327805
16. 3 unassigned wu 0 0 (0/0/0) 0
17. 4 unassigned wu 0 0 (0/0/0) 0
18. 5 unassigned wu 0 0 (0/0/0) 0
19. 6 unassigned wu 0 0 (0/0/0) 0
20. 7 unassigned wu 0 0 (0/0/0) 0
21. 8 boot wu 0 - 0 7.84MB (1/0/0) 16065
22. 9 unassigned wu 0 0 (0/0/0) 0
23. partition>quit
25. format> label
26. [0] SMI Label
27. [1] EFI Label
28. Specify Label type[0]: 0
29. Ready to label disk, continue? y

添加磁盤

現在把做好的新磁盤分區加入根池形成鏡像池，這一步裡數據的同步可能會花費比較長的時間

1. # zpool attach rpool c0d0s0 c0d2s0
   
2. Make sure to wait until resilver is done before rebooting.
4. # zpool status
5. pool: rpool
6. state: ONLINE
7. status: One or more devices is currently being resilvered. The pool will
8. continue to function, possibly in a degraded state.
9. action: Wait for the resilver to complete.
10. scan: resilver in progress since Wed Jul 24 15:39:51 2013
11. 302M scanned out of 7.47G at 11.2M/s, 0h10m to go
12. 269M resilvered, 3.95% done
13. config:
15. NAME STATE READ WRITE CKSUM
16. rpool ONLINE 0 0 0
17. mirror-0 ONLINE 0 0 0
18. c0d0s0 ONLINE 0 0 0
19. c0d2s0 ONLINE 0 0 0 (resilvering)
21. errors: No known data errors

安裝啟動塊

On a SPARC based system:
# installboot -F zfs /usr/platform/`uname -i`/lib/fs/zfs/bootblk /dev/rdsk/c1t9d0s0
On an x86 based system:
# installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c1t9d0s0

驗證boot

首先查看boot path

1. # prtconf -vp|grep -i bootpath
   
2. bootpath: '/virtual-devices@100/channel-devices@200/disk@0:a'

可以推斷出新盤path的末尾是disk@2:a，然後啟動

1. {0} ok setenv boot-device /virtual-devices@100/channel-devices@200/disk@2:a
   boot-device = /virtual-devices@100/channel-devices@200/disk@2:a
   {0} ok printenv boot-device
   boot-device = /virtual-devices@100/channel-devices@200/disk@2:a
   
2. ok boot /virtual-devices@100/channel-devices@200/disk@2:a

移除老磁盤

1. # zpool detach rpool c0d0s0

擴展池空間

由於之前的磁盤空間小於新盤，所以現在的空間是和之前一樣的，需要擴展一下。

1. # zpool set autoexpand=on rpool

至此為止，大功告成。